Take a look at the full headers of the message being returned as a duplicate. While I'm not a betting man, I'd be willing to wager that they'll show the mail went through some list recipient's mail system and looped back to LISTSERV. Nathan From: LISTSERV site administrators' forum [mailto:[log in to unmask]] On Behalf Of GT Sent: Friday, January 18, 2013 8:24 AM To: [log in to unmask] Subject: Rejected Posting - Message Is Still Distributed Hello, There is a list that produces the following error message if a posting is Replied to, however, the message does get distributed: Your message is being returned to you unprocessed because it appears to have already been distributed to the CCR-NETWORK list. That is, a message with identical text (but possibly with different mail headers) has been posted to the list recently, either by you or by someone else. If you have reason to resend this message to the list (for instance because you have been notified of a hardware failure with loss of data), please alter the text of the message in some way and resend it to the list. Altering the "Subject:" line or adding blank lines at the top or bottom of the message is not sufficient; instead, you should add a sentence or two at the top explaining why you are resending the message. This explanation will help the other subscribers understand why they are getting two copies of the same message. I setup a test list configured identical to the list in question, and had no errors with multiple replies. I also ensure that the subscribers were also configure identically. Here is the configuration of the list: Notify= No Default-Options= SUBJ Default-Options= REPRO Subject-Tag= "CCR-Listserv" Attachments= Yes Subscription= By_Owner,Confirm Ack= Yes Confidential= No Validate= No Reply-to= List,Respect Review= Public Send= Public,Confirm,Non-Member Errors-To= Owner Owner= [log in to unmask]<mailto:[log in to unmask]> Notebook= No Thanks! ________________________________ To unsubscribe from the LSTSRV-L list, click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1 ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1